A new study from the Massachusetts Institute of Technology (MIT) has introduced a transformative chemical fuel system that could redefine buoyancy control for long-range autonomous underwater vehicles (AUVs).Published in Cell Reports Physical
A new study from the Massachusetts Institute of Technology (MIT) has introduced a transformative chemical fuel system that could redefine buoyancy control for long-range autonomous underwater vehicles (AUVs).
Published in Cell Reports Physical Science, the research demonstrates that reacting activated aluminum with aqueous ammonia significantly enhances gas generation and energy density compared to traditional aluminum-water chemistry.
This breakthrough provides a viable path for extending mission duration and reducing costs for underwater platforms that currently rely on lower-energy-density lithium-ion batteries.
Current buoyancy engines typically rely on either power-hungry mechanical pumps or heavy, low-efficiency compressed gas cylinders. This new technology, developed by Francisco Jeldres and Douglas P. Hart, shifts the paradigm toward in-situ, on-demand chemical gas generation. By utilizing a 30% ammonia solution as a solvent, the reaction generates hydrogen gas, ammonia vapor, and thermal energy-delivering significantly more potential energy per unit volume of fuel and solvent than existing methods.
"The core advantage is the departure from passive, high-pressure storage in favor of active, in-situ generation within a flooded section of the vehicle", said lead researcher Francisco Jeldres. "This significantly reduces the vehicle's structural weight by replacing heavy pressure vessels with a compact, simple reaction assembly that operates effectively at ambient hydrostatic pressure.
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